BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Asia/Hong_Kong BEGIN:STANDARD DTSTART:19791021T023000 TZOFFSETFROM:+0900 TZOFFSETTO:+0800 TZNAME:HKT END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20220418T071549Z UID:1B2AB216-03C1-45C6-B283-F22F9570A339 DTSTART;TZID=Asia/Hong_Kong:20220415T150000 DTEND;TZID=Asia/Hong_Kong:20220415T170000 DESCRIPTION:Energy sustainability is a major concern in 6G and Internet-of- Things (IoT) due to the lack of mature solutions for powering and keeping uninterrupted operations for a massive number of devices. Therefore\, wire less power transfer (WPT) and energy harvesting (EH) technologies are now strongly under investigation by the research community and industries. Amb ient EH does not require additional resource/power consumption from the su rrounded energy network infrastructure\, but it usually requires longer ti me to harvest sufficient energy. Moreover\, temporal/geographical/environm ental circumstances may limit ambient EH services making them inappropriat e for many use cases with quality of service (QoS) requirements. For what the dedicated WPT concerns\, it can be subdivided into either near-field ( NF) or far-field (FF) WPT\, according to the electromagnetic coupling phen omenon which makes possible the wireless transfer of energy: NF WPT is mai nly based on induction (based on the inductive coupling effect of non-radi ative electromagnetic fields\, including the inductive and capacitive mech anisms\, and is subject to coupling misalignment impairments that limit th e range and scalability) or magnetic coupling between objects (coils) reso nating at the same frequency which tend to couple with each other efficien tly\, and these phenomena happen within the reactive region (non-radiative ) of the generated fields\; on the other hand\, FF WPT\, also known as rad iative WPT\, exploits the propagation of the electromagnetic field in the radiative region of an antenna device\, similarly to a wireless communicat ion system. Because of the different coupling phenomenon\, NF WPT is usual ly associated to short-range WPT where it can achieve high efficiency\, wh ile radiative WPT is often the choice for long-range WPT. Therefore\, radi ative WPT constitutes the most prominent technology for massively and wire lessly powering low-energy IoT deployments\, which can be combined with am bient EH for low duty-cycle communication requirements. Unfortunately\, ra diative WPT is not as effective as NF WPT because of the limited sensitivi ty of conventionally employed Schottky rectification diodes\, and this is strongly limiting the application of this technology in practice\, except for few cases. Nonetheless\, the discussion about the radiative WPT applic ability has been left at a relatively general level in the open literature \, which mainly discusses WPT system components and their design/implement ation separately\, without instead analyze the complete WPT system efficie ncy maximization problem.\n\nIn this lecture\, the fundamental concepts of WPT will be introduced by analyzing all components of a conventional WPT system. After that\, the talk will focus on the air link radiative WPT sec tion and will discuss the theoretical power transfer efficiency of two ant enna apertures and its dependency on the working frequency\, for both narr owband and wideband transmitting signals. The design and optimization of h igh efficiency discrete apertures will be then described based on microwav e network theory. This analysis framework will also be extended to the com plete radiative WPT system design\, highlighting that the non-linearity of power source and rectification components requires to consider the whole radiative WPT system optimization and not only the single component effici ency maximization. Finally the applicability of the radiative WPT technolo gy will be discussed\, with particular emphasis on microwave space-based s olar power stations and millimeter-wave frequencies regime.\n\nCo-sponsore d by: IEEE APS-Shenzhen Chapter\n\nSpeaker(s): Daniele Inserra\, \n\nVirt ual: https://events.vtools.ieee.org/m/311677 LOCATION:Virtual: https://events.vtools.ieee.org/m/311677 ORGANIZER:heyejun@126.com SEQUENCE:7 SUMMARY:Radiative wireless power transfer with microwave and mm-wave: is th ere anything concretely possible with this technology? URL;VALUE=URI:https://events.vtools.ieee.org/m/311677 X-ALT-DESC:Description: <br /><p>Energy sustainability is a major concern i n 6G and Internet-of-Things (IoT) due to the lack of mature solutions for powering and keeping uninterrupted operations for a massive number of devi ces. Therefore\, wireless power transfer (WPT) and energy harvesting (EH) technologies are now strongly under investigation by the research communit y and industries. Ambient EH does not require additional resource/power co nsumption from the surrounded energy network infrastructure\, but it usual ly requires longer time to harvest sufficient energy. Moreover\, temporal/ geographical/environmental circumstances may limit ambient EH services mak ing them inappropriate for many use cases with quality of service (QoS) re quirements. For what the dedicated WPT concerns\, it can be subdivided int o either near-field (NF) or far-field (FF) WPT\, according to the electrom agnetic coupling phenomenon which makes possible the wireless transfer of energy: NF WPT is mainly based on induction (based on the inductive coupli ng effect of non-radiative electromagnetic fields\, including the inductiv e and capacitive mechanisms\, and is subject to coupling misalignment impa irments that limit the range and scalability) or magnetic coupling between objects (coils) resonating at the same frequency which tend to couple wit h each other efficiently\, and these phenomena happen within the reactive region (non-radiative) of the generated fields\; on the other hand\, FF WP T\, also known as radiative WPT\, exploits the propagation of the electrom agnetic field in the radiative region of an antenna device\, similarly to a wireless communication system. Because of the different coupling phenome non\, NF WPT is usually associated to short-range WPT where it can achieve high efficiency\, while radiative WPT is often the choice for long-range WPT. Therefore\, radiative WPT constitutes the most prominent technology f or massively and wirelessly powering low-energy IoT deployments\, which ca n be combined with ambient EH for low duty-cycle communication requirement s. Unfortunately\, radiative WPT is not as effective as NF WPT because of the limited sensitivity of conventionally employed Schottky rectification diodes\, and this is strongly limiting the application of this technology in practice\, except for few cases. Nonetheless\, the discussion about the radiative WPT applicability has been left at a relatively general level i n the open literature\, which mainly discusses WPT system components and t heir design/implementation separately\, without instead analyze the comple te WPT system efficiency maximization problem.&nbsp\;&nbsp\;&nbsp\;</p>\n< p>In this lecture\, the fundamental concepts of WPT will be introduced by analyzing all components of a conventional WPT system. After that\, the ta lk will focus on the air link radiative WPT section and will discuss the t heoretical power transfer efficiency of two antenna apertures and its depe ndency on the working frequency\, for both narrowband and wideband transmi tting signals. The design and optimization of high efficiency discrete ape rtures will be then described based on microwave network theory. This anal ysis framework will also be extended to the complete radiative WPT system design\, highlighting that the non-linearity of power source and rectifica tion components requires to consider the whole radiative WPT system optimi zation and not only the single component efficiency maximization. Finally the applicability of the radiative WPT technology will be discussed\, with particular emphasis on microwave space-based solar power stations and mil limeter-wave frequencies regime.</p>\n<p>&nbsp\;</p> END:VEVENT END:VCALENDAR